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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '549f984932fc5205da15176e1b8d0a62bb9c34873cf7c2ed08723eaa7ab28d6a' 
  AND token = 'K2rZFZZcr8xFSQlgHCL/qAO8CrKTSdPTaZwEu40KuIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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