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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11f80e19a83eefcb6c2036c05f75e5c36cd1b5e06c706eab32d9dc8919783096' 
  AND token = 'uVdZKgJZ/dt5SnZUz1eJhIjbiy0fmuKXop2bCzhCgsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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