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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb0d108d1d16e73a6a317103fbb57b51a92e568b9359b5b7aa10c95d159d9407' 
  AND token = 'boScQioGbqL9XD2/zDNCt4KKzq/GKj4r2L/M+xMXUyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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