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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58315097c7f8a8f94a059fd02a9a54e97edb01dd6547e374cc6388c3438a1954' 
  AND token = '5LIrLy6lpl11KUxAJLvcJx/GLEs8iL1nrIhzdwVWUto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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