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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d21f0bafe75657b5ee8c5fb5dc601373096893bc988671ddfdda8dc4f6065c6' 
  AND token = '606iM372Y2q+t4QERDQSGPGZ8zZ8xsC2CZSVyf0Ny7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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