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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f6345e4b20e4b988f2036f96790de30a1c23b5cbe36e156aa46c109952afae2' 
  AND token = 'FjN9QwiQ1Ns6BsZ3OvjddDbyzK5sB7Qdc3PUvnnXhq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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