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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ddf892d49f6c3f473e452a06a345521238ae6e61acc1c83d1178fed3d67627e' 
  AND token = 'iiG592m8pixlqUswnvxjPbRzl0IltEto5AojQDZZpv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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