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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61aca23508f04e49df250666c02c4feae8529f669f6799788e8cb9f7a20580c6' 
  AND token = '+OZYc/Te+hFU9XUDjoZK88NiTN1p9UzessSBaJeq904=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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