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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29bb8210783c3c9b501a077502d70e05b26cad8e47b7d34e5c5a7296bd6afcd2' 
  AND token = 'i9VtLNBpSdE48FRmazpJECJhWXKcduT9Ja6D2p84hEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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