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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '114f2f7c128b6d07b6bde99b945eb4819338801f2bf7b2f171ba60138bbfa254' 
  AND token = 'xQaXCIAIHPp0cgQgFe7GT2oB3NIReGT1b7E3Le9BNqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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