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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56707581e5fac93efc7b307bc6f78fe4dd0e4a2329fa493ca5364730f17141b' 
  AND token = '0utisUAIJrfE3jnx71Nlt0IpCFmMl5QaWXt6ztSq0H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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