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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '297578fdc204aa489cb4b58aa5f8ab9bb99c034bf1795e1837cd28a6e159d8e5' 
  AND token = 'Qb/eFDfYgDoDAPbkCbdq3VdjNnofn/DboUwrl9VVNnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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