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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32ad5b45f49a1cc2210805d451d9496bd4b35d10349117ca2689ec15c518237c' 
  AND token = 'c3XtztMCN6hA3dcUhMnJCnIyzN3kc1z2zAvRmj6e4rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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