SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cac98c8282d7436ac66d8757411d85bfb926e7d8991fe954343335cbff86c3d3' 
  AND token = 'DtwJnxHIuDnzagsM2X34BxAuitJn+P95i1yGwYSmuSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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