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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30da2433955fd020db51fdb70029bffc1aca735f3d50c84895eac1e2399b5508' 
  AND token = 'zPwpBuXC7wHSFO7A1xIP/Y5t85IStfc2myBFSeFwFWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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