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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdd7ed74e870071be837c5400452a49be13aa8cd379e2206cc609384b95f5a36' 
  AND token = '4c0sCCyKC2K4joA7lwbNEiQotmcG9L6fO3eqzbZDK8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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