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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1675a57da6feaf3d67af892b8f917ebf7431e1587c6acabb5349473f04ba12c5' 
  AND token = 'kqfEKJoZ6m3ApBqhWEUpDKD3T8MBXEOE5Zaz+3VXTN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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