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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '530872ea525f47c5b0c6f4937cf5fa9da06c223b8212ac84b9aebe862baa47c6' 
  AND token = 'KnBADZ7rqgoSt2lJ0E251MsAcDFdsnYeDD29F8BXMXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}