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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c068a1520e274d7202a76d223ca0efd1130a4a1277c61d3f179a45e07982d0b6' 
  AND token = 'kMJ6kul9WrEuXAu/UgCvaA41r6ilf6BHbIlK7K9NBhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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