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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cfa04ca294631ab40ba99db3b8898202b33684b30506ea12d0eb0462bab10f7' 
  AND token = 'iyFRpunLc7ObFiKqbWG8azPwlY5g/jSo1xq3EO34rzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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