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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ce8cbf8147936e3b1324909b788da81ae96fd4c1e56e964f611d2e2939e8aae' 
  AND token = 'LvKSl7rnhcH3mVzWrliskkJoahhzRi1SwpZMbByliG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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