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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf8ea83862e279c53318abbdd593f0ee3937f8bece8a98b42059eeb696db767f' 
  AND token = 'c4Eq3bFjsharVmTBSq8wo79TTAWdb6tfxJ93umEoMkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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