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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1e5fa8911f44e2128c7a9b7ebda7d4033cae0dbcdf77790ef23b41f6f7a8715' 
  AND token = 'S1ZWSLpErD5xirKig+IThkM5v6alhsAv2wCC45V3Tyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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