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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db307c724e5c14273aea20d805818f8c1decb6b6b613a9384b91cc1cb4ba0b41' 
  AND token = 'bj/v5B4ZeETG/PiyzXgUWF2+EAUCMbc9tJmrpIvc8HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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