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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '104480b9f5421742f894d87d8a7a08f59b49edf829e54ceb2f4b6ae9c08b53dd' 
  AND token = 'XrIQLpQKZ11+iOEX79SiMBk4aTEXz6/SWH5b69cYERU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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