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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d5b521efd43e3614ae6cddaa7fe3f757119c2ee5fe425b24cd34252c7d712b6' 
  AND token = '/oAH2gvf6SAU/xzAnNf/gPFfjvigv1hzTh7yd6x6IJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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