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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f38fbb4d8f9aee8ea33118b82f0fda01b24ddbf4f21fcf80f39808f8a53f834' 
  AND token = '04uR/ODUPzAO6vASj+/R5Q6SB1EkhpKtE113MNx+UGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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