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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d7611a8fe9b267a4665eb47f4f2051ebf667eba808beb643631a4f9e00f2e6a' 
  AND token = 'jRnriK33pJWw9K1rv40b8yRWXX9kO0OI+h+JS9sRqwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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