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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '624ce368f976804bab8511084ac78556789ebd9bfe60408c15dc3533535b81c1' 
  AND token = 'HtZZwh67Odx7oNm8l74MrLG+oMHmGwteSzw65zeKrcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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