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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '045c27e72119eff0ae8833e29de378b11a867cadac30fe33a9eb18fdf3031a0e' 
  AND token = 'eqxADj6Y5wnJRephPJ1lZLgHMkdHZ7hoCSg9pcBIv7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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