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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfd821709052c0c36a6a27c7355d24040007229c1c70b751d9dd17d640f6f7c8' 
  AND token = 'wS59IFCElvPpdfAELGR9Jdxuak8q5dvr+7F92Ue3YoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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