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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abc2f728e2c2460c42d7b1ea0be6ec25aff641e2af9cd31113f196a7eac2831f' 
  AND token = 'V1CIBf1Jcyx5B6VL58ICk95xczUH48zmodJAJUT/XPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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