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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38b4f8e4a247678030a5ab5ba156c6ca80f55d3e075edb9526f0225896f2ae33' 
  AND token = '7Zd8IaToXY1tY2MNCAwX9dDnCV62NBQyfP1PY/Zbsfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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