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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd28b602c40bb1ab8ce90eb075e22d5d630f4488a8f0374cbc05b1f3f6b61ff2f' 
  AND token = 'El4gOqOiEl4Lf7IXL+c+dgL2Rxw1ySUCMY/T1uZxSdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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