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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16c680910bd8e7d90dfbb6d735a36720135ed23e91a8c4ca3a505a8474762b33' 
  AND token = 'q/BRNKxbdFo/C2Gwm150BcO4mL9Sg/+11eIvgANL6yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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