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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ed2769908918efeb50e01433768cd9f4fbf1b5f66f321d3945bd0cf85a08ef5' 
  AND token = 'okylnxfnm3wD80eZ4s8JK2Au4a5S1zxVFubzeJffKyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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