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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7437cf7969ca3799ee070bd539517936a5305cc1126a9412394fa532b8b6a380' 
  AND token = 'nuIGEWaxu9fLphpgQlrad0O0N6MPResdoK65v6iut5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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