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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fa7bd39b728ee4227e8ada6dc2664a79ad31057bcffcccbf67e56e10a43a889' 
  AND token = '+8qNDjLWOZXpf6M3bWdXwf0dahJrq6J+KuElMnqHSxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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