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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'def6feca50f4ba3d8a5717d90540374905ce31f804a62cd8c720fa36b37ad4c2' 
  AND token = 'P+EiTviO26aC1KtWc7IFOFrIXsKARuutFgiyCnlAYYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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