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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c826bae624c1c93555075723e92c0fad3f48d4d767a3e5236ba94ebf329e7f7e' 
  AND token = 'qtHax8Q9Us7h7Qb7SNZn0FPzsNL7y4yI4sj3yWwgUj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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