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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f212ff64d316b6e2f2e7814553ce3a88fc75929a7a5fac282fec38f8c163961' 
  AND token = '5jNH51gEntL2HJcTSjBmfYNXbjV8FG7c5HcxXei7z8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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