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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a53d8c7f7e8f2445e2d7fd5ad5af3b87f0783ce2e74c3bbb3a5902a1916660c1' 
  AND token = 'pWu+yjJOhZF6ntVDjXeQ6+0L21Ru8S7ys98LpBc59iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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