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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1499f58ff3716fd5ec4c62bd5418f7b3c0626a008752d6932efd72711dc2619' 
  AND token = 'L4n9217NSG53pgW7OrGipMdGY6I6DmeiCSLsoYJhU4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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