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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '540ccda0fdb14bf6f38bbbfb2cf0a748996cfca1c1723aaa12ac8c62386db6d4' 
  AND token = 'z1hL4FP9YMwaRQxnsdKmvlfer0oN8AQf40eW04pVJ2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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