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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cee28ec73f61ca0820ceb3ee694990e49dac3049c84c1c5b12e3a35eadafbd37' 
  AND token = 'GPSPoC4yEIQWvNY3v21neM9Isr3HoAQM6ixHyRx/GD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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