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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a83b2050e018da20f9ccf38a88e3de1e5e9db19ca6a61153fb00e7dcc9a3afdf' 
  AND token = 'IkJo5GRLIBotvEKm45rkoin/NIahOCFwCr1q+dRovMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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