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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef772556608fe7b34353b59e08471b80cf0106dc224b25332569a0901ee3d8bf' 
  AND token = 't5aH9SLN+HXwhPcQ4VVJTDe0J5WPCEROFAEozf7wh8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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