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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8d395c816ad8d9e370e1de27e48926173386c4648b0755df86eae572abf085f' 
  AND token = 'jQ7v6nMuxFwl6yLSq34nMILlFFq0fB/AuKIu/Sq8diw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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