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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b18be53407915d357f64dfdc57c1e50464784e9353b7cc849220fe3c7648426' 
  AND token = 'YoWNVD3ykp60TbRJQdTr8xVCS5G4Xk13jF7XbercAvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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