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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f29aa590839b7d7d12a95e560f0da8a555bc275663ecf59e196a122700dfd561' 
  AND token = 'qTFWeWL7Shh5e1UkH5eQY/61m6hCJWHb7p4miQa/tpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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